When i was in the US i tipped whatever the expected amount was then - 10% i think (10? years ago).
In Australia or the UK it has depended on the situation... work dinner function where the total bill is often ~$1000.00 or $1500.00 (20-30 people) i would expect to round it up to the nearest 20 or 50 dollar mark.
Dinner at a classy resturant (bill around the $200.00 mark) i would round to the nearest $10/20 depending on service.
The only time i have felt i made a mistake with a tip tho was in the UK when i accidentally rounded a 24 pound dinner to 40 pounds, and it had been a rather disappointing meal. Considering my mental arithmatic at the time told me i just tipped someone ~45 on a ~65 meal that should have cost ~30 max...
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When i was in the US i tipped whatever the expected amount was then - 10% i think (10? years ago).
In Australia or the UK it has depended on the situation... work dinner function where the total bill is often ~$1000.00 or $1500.00 (20-30 people) i would expect to round it up to the nearest 20 or 50 dollar mark.
Dinner at a classy resturant (bill around the $200.00 mark) i would round to the nearest $10/20 depending on service.
The only time i have felt i made a mistake with a tip tho was in the UK when i accidentally rounded a 24 pound dinner to 40 pounds, and it had been a rather disappointing meal. Considering my mental arithmatic at the time told me i just tipped someone ~45 on a ~65 meal that should have cost ~30 max...
Taxi/take away delivery/bartender etc never tip.